Merits of the Helpers in Madinah (Ansaar)

Bukhari :: Book 5 :: Volume 58 :: Hadith 237

Narrated Abu Wail:

We visited Khabbaba who said, "We migrated with the Prophet for
Allah's Sake, so our reward became due and sure with Allah. Some of
us passed away without taking anything of their rewards (in this
world) and one of them was Mus'ab bin 'Umar who was martyred on the
day (of the battle) of Uhud leaving a striped woolen cloak. When we
covered his head with it, his feet became naked, and when covered
his feet, his head became naked.

So Allah's Apostle ordered us to cover his head and put some
Idhkhir (i.e. a special kind of grass) on his feet. (On the other
hand) some of us have had their fruits ripened (in this world) and
they are collecting them."